Selected PLOS Biology research articles are accompanied by a synopsis written for a general audience to provide non-experts with insight into the significance of the published work.
Please follow our
guidelines for comments
and review our
competing interests policy.
Comments that do not conform to our guidelines will be promptly removed and the user account disabled.
The following must be avoided:
Remarks that could be interpreted as allegations of misconduct
There was an error in the third sentence of the second paragraph. The correct sentence is: In this study, the authors drew samples from 22 individuals buried in a graveyard near the village of Derenberg in the German state of Saxony-Anhalt, about 100 miles southwest of Berlin.